Google+ Now Lets Anyone Send A Message To Your Gmail Inbox — Here's How To Block It

Google announced today that it will roll out a feature for
Google+ that lets anyone send you a message directly to your
Gmail inbox using the social network.

That means anyone can send you an email through Gmail, just by
looking up your profile on Google+. The downside? Google has this
feature switched on by default, so if you don't want people
sending you unsolicited Gmail messages using Google+, you'll have
to switch it off.

The feature isn't available to everyone yet, so keep your eye on
it. Here's how to switch it off when you do get it though:

Under settings, you'll see a section marked "Email via Google+."
It's best to switch the option to "No one" if you want to block
people from sending you emails through Google+. You'll also have
the option to only let people you have in your Circles send you a
message.

Gmail Blog

If you do get an email from
someone in Google+, it'll show up in the primary tab in your
inbox if they're already in one of your Google+ circles. If not,
their email will be filtered into the "Social" tab. This is
probably Google's way of eliminating people from spamming you
using Google+. Still, it's best to just switch the feature off
completely.